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Note 12 - Equity Investment (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Mar. 28, 2013
M W L [Member] | Percentage Owned by Non-related Party [Member]        
Equity Method Investment, Ownership Percentage 55.00%      
M W L [Member] | Intersegment Eliminations [Member]        
Revenue, Net     $ 2,100,000  
M W L [Member] | Trade Accounts Receivable [Member]        
Due from Affiliates $ 204,000      
M W L [Member] | Current Accounts Receivable [Member]        
Due to Affiliate $ 4,300,000      
M W L [Member]        
Equity Method Investment, Ownership Percentage 45.00%      
Equity Method Investments       $ 2,600,000
Revenue from Related Parties $ 5,000,000 $ 8,500,000 $ 8,200,000